3/1/2011
7,896,255
Partly foamed railroad track support arrangement
Frenzel of MSB Management, Germany, has developed a track superstructure for a railway on a subgrade consisting of a ballast structure of ballast stones and sleepers embedded in the ballast structure.  The ballast consists of  load dissipation regions beneath the sleepers, the regions receiving loads acting vertically on the ballast structure via the sleepers when a train rides on the rails and transferring these loads to the subgrade below the ballast structure.  The voids between the ballast stones are partially filled with a foam material, especially a PU polyurethane foam material, for fixing the ballast stones in a stable position and permit water drainage.  (RDC 9/9/2011)